/*
* @(#)Krb5LoginModule.java 1.32 06/06/01
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package com.sun.security.auth.module;
import java.io.*;
import java.net.*;
import java.text.MessageFormat;
import java.util.*;
import javax.security.auth.*;
import javax.security.auth.kerberos.*;
import javax.security.auth.callback.*;
import javax.security.auth.login.*;
import javax.security.auth.spi.*;
import sun.security.krb5.*;
import sun.security.krb5.Config;
import sun.security.krb5.RealmException;
import sun.security.util.AuthResources;
import sun.security.jgss.krb5.Krb5Util;
import sun.security.krb5.Credentials;
import sun.misc.HexDumpEncoder;
/**
* <p> This <code>LoginModule</code> authenticates users using
* Kerberos protocols.
*
* <p> The configuration entry for <code>Krb5LoginModule</code> has
* several options that control the authentication process and
* additions to the <code>Subject</code>'s private credential
* set. Irrespective of these options, the <code>Subject</code>'s
* principal set and private credentials set are updated only when
* <code>commit</code> is called.
* When <code>commit</code> is called, the <code>KerberosPrincipal</code>
* is added to the <code>Subject</code>'s
* principal set and <code>KerberosTicket</code> is
* added to the <code>Subject</code>'s private credentials.
*
* <p> If the configuration entry for <code>KerberosLoginModule</code>
* has the option <code>storeKey</code> set to true, then
* <code>KerberosKey</code> will also be added to the
* subject's private credentials. <code>KerberosKey</code>, the principal's
* key will be either obtained from the keytab or
* derived from user's password.
*
* <p> This <code>LoginModule</code> recognizes the <code>doNotPrompt</code>
* option. If set to true the user will not be prompted for the password.
*
* <p> The user can specify the location of the ticket cache by using
* the option <code>ticketCache</code> in the configuration entry.
*
* <p>The user can specify the keytab location by using
* the option <code>keyTab</code>
* in the configuration entry.
*
* <p> The principal name can be specified in the configuration entry
* by using the option <code>principal</code>. The principal name
* can either be a simple user name or a service name such as
* <code>host/mission.eng.sun.com</code>. The principal can also
* be set using the system property <code>sun.security.krb5.principal</code>.
* This property is checked during login. If this property is not set, then
* the principal name from the configuration is used. In the
* case where the principal property is not set and the principal
* entry also does not exist, the user is prompted for the name.
*
* <p> The following is a list of configuration options supported
* for <code>Krb5LoginModule</code>:
* <dl>
* <blockquote><dt><b><code>refreshKrb5Config</code></b>:</dt>
* <dd> Set this to true, if you want the configuration
* to be refreshed before the <code>login</code> method is called.</dd>
* <P>
* <dt><b><code>useTicketCache</code></b>:</dt>
* <dd>Set this to true, if you want the
* TGT to be obtained
* from the ticket cache. Set this option
* to false if you do not want this module to use the ticket cache.
* (Default is False).
* This module will
* search for the tickect
* cache in the following locations:
* For Windows 2000, it will use Local Security Authority (LSA) API
* to get the TGT. On Solaris and Linux
* it will look for the ticket cache in /tmp/krb5cc_<code>uid</code>
* where the uid is numeric user
* identifier. If the ticket cache is
* not available in either of the above locations, or if we are on a
* different Windows platform, it will look for the cache as
* {user.home}{file.separator}krb5cc_{user.name}.
* You can override the ticket cache location by using
* <code>ticketCache</code>
* <P>
* <dt><b><code>ticketCache</code></b>:</dt>
* <dd>Set this to the name of the ticket
* cache that contains user's TGT.
* If this is set, <code>useTicketCache</code>
* must also be set to true; Otherwise a configuration error will
* be returned.</dd>
* <P>
* <dt><b><code>renewTGT</code></b>:</dt>
* <dd>Set this to true, if you want to renew
* the TGT. If this is set, <code>useTicketCache</code> must also be
* set to true; otherwise a configuration error will be returned.</dd>
* <p>
* <dt><b><code>doNotPrompt</code></b>:</dt>
* <dd>Set this to true if you do not want to be
* prompted for the password
* if credentials can
* not be obtained from the cache or keytab.(Default is false)
* If set to true authentication will fail if credentials can
* not be obtained from the cache or keytab.</dd>
* <P>
* <dt><b><code>useKeyTab</code></b>:</dt>
* <dd>Set this to true if you
* want the module to get the principal's key from the
* the keytab.(default value is False)
* If <code>keyatb</code>
* is not set then
* the module will locate the keytab from the
* Kerberos configuration file.</dd>
* If it is not specifed in the Kerberos configuration file
* then it will look for the file
* <code>{user.home}{file.separator}</code>krb5.keytab.</dd>
* <P>
* <dt><b><code>keyTab</code></b>:</dt>
* <dd>Set this to the file name of the
* keytab to get principal's secret key.</dd>
* <P>
* <dt><b><code>storeKey</code></b>:</dt>
* <dd>Set this to true to if you want the
* principal's key to be stored in the Subject's private credentials. </dd>
* <p>
* <dt><b><code>principal</code></b>:</dt>
* <dd>The name of the principal that should
* be used. The principal can be a simple username such as
* "<code>testuser</code>" or a service name such as
* "<code>host/testhost.eng.sun.com</code>". You can use the
* <code>principal</code> option to set the principal when there are
* credentials for multiple principals in the
* <code>keyTab</code> or when you want a specific ticket cache only.
* The principal can also be set using the system property
* <code>sun.security.krb5.principal</code>. In addition, if this
* system property is defined, then it will be used. If this property
* is not set, then the principal name from the configuration will be
* used.</dd>
* <P>
* <dt><b><code>isInitiator</code></b>:</dt>
* <dd>Set this to true, if initiator. Set this to false, if acceptor only.
* (Default is true).
* Note: Do not set this value to false for initiators.</dd>
* </dl></blockquote>
*
* <p> This <code>LoginModule</code> also recognizes the following additional
* <code>Configuration</code>
* options that enable you to share username and passwords across different
* authentication modules:
* <pre>
*
* useFirstPass if, true, this LoginModule retrieves the
* username and password from the module's shared state,
* using "javax.security.auth.login.name" and
* "javax.security.auth.login.password" as the respective
* keys. The retrieved values are used for authentication.
* If authentication fails, no attempt for a retry
* is made, and the failure is reported back to the
* calling application.
*
* tryFirstPass if, true, this LoginModule retrieves the
* the username and password from the module's shared
* state using "javax.security.auth.login.name" and
* "javax.security.auth.login.password" as the respective
* keys. The retrieved values are used for
* authentication.
* If authentication fails, the module uses the
* CallbackHandler to retrieve a new username
* and password, and another attempt to authenticate
* is made. If the authentication fails,
* the failure is reported back to the calling application
*
* storePass if, true, this LoginModule stores the username and
* password obtained from the CallbackHandler in the
* modules shared state, using
* "javax.security.auth.login.name" and
* "javax.security.auth.login.password" as the respective
* keys. This is not performed if existing values already
* exist for the username and password in the shared
* state, or if authentication fails.
*
* clearPass if, true, this <code>LoginModule</code> clears the
* username and password stored in the module's shared
* state after both phases of authentication
* (login and commit) have completed.
* </pre>
* <p>Examples of some configuration values for Krb5LoginModule in
* JAAS config file and the results are:
* <ul>
* <p> <code>doNotPrompt</code>=true;
* </ul>
* <p> This is an illegal combination since <code>useTicketCache</code>
* is not set and the user can not be prompted for the password.
*<ul>
* <p> <code>ticketCache</code> = < filename >;
*</ul>
* <p> This is an illegal combination since <code>useTicketCache</code>
* is not set to true and the ticketCache is set. A configuration error
* will occur.
* <ul>
* <p> <code>renewTGT</code>=true;
*</ul>
* <p> This is an illegal combination since <code>useTicketCache</code> is
* not set to true and renewTGT is set. A configuration error will occur.
* <ul>
* <p> <code>storeKey</code>=true
* <code>useTicketCache</code> = true
* <code>doNotPrompt</code>=true;;
*</ul>
* <p> This is an illegal combination since <code>storeKey</code> is set to
* true but the key can not be obtained either by prompting the user or from
* the keytab.A configuration error will occur.
* <ul>
* <p> <code>keyTab</code> = < filename > <code>doNotPrompt</code>=true ;
* </ul>
* <p>This is an illegal combination since useKeyTab is not set to true and
* the keyTab is set. A configuration error will occur.
* <ul>
* <p> <code>debug=true </code>
*</ul>
* <p> Prompt the user for the principal name and the password.
* Use the authentication exchange to get TGT from the KDC and
* populate the <code>Subject</code> with the principal and TGT.
* Output debug messages.
* <ul>
* <p> <code>useTicketCache</code> = true <code>doNotPrompt</code>=true;
*</ul>
* <p>Check the default cache for TGT and populate the <code>Subject</code>
* with the principal and TGT. If the TGT is not available,
* do not prompt the user, instead fail the authentication.
* <ul>
* <p><code>principal</code>=< name ><code>useTicketCache</code> = true
* <code>doNotPrompt</code>=true;
*</ul>
* <p> Get the TGT from the default cache for the principal and populate the
* Subject's principal and private creds set. If ticket cache is
* not available or does not contain the principal's TGT
* authentication will fail.
* <ul>
* <p> <code>useTicketCache</code> = true
* <code>ticketCache</code>=< file name ><code>useKeyTab</code> = true
* <code> keyTab</code>=< keytab filename >
* <code>principal</code> = < principal name >
* <code>doNotPrompt</code>=true;
*</ul>
* <p> Search the cache for the principal's TGT. If it is not available
* use the key in the keytab to perform authentication exchange with the
* KDC and acquire the TGT.
* The Subject will be populated with the principal and the TGT.
* If the key is not available or valid then authentication will fail.
* <ul>
* <p><code>useTicketCache</code> = true
* <code>ticketCache</code>=< file name >
*</ul>
* <p> The TGT will be obtained from the cache specified.
* The Kerberos principal name used will be the principal name in
* the Ticket cache. If the TGT is not available in the
* ticket cache the user will be prompted for the principal name
* and the password. The TGT will be obtained using the authentication
* exchange with the KDC.
* The Subject will be populated with the TGT.
*<ul>
* <p> <code>useKeyTab</code> = true
* <code>keyTab</code>=< keytab filename >
* <code>principal</code>= < principal name >
* <code>storeKey</code>=true;
*</ul>
* <p> The key for the principal will be retrieved from the keytab.
* If the key is not available in the keytab the user will be prompted
* for the principal's password. The Subject will be populated
* with the principal's key either from the keytab or derived from the
* password entered.
* <ul>
* <p> <code>useKeyTab</code> = true
* <code>keyTab</code>=< keytabname >
* <code>storeKey</code>=true
* <code>doNotPrompt</code>=true;
*</ul>
* <p>The user will be prompted for the service principal name.
* If the principal's
* longterm key is available in the keytab , it will be added to the
* Subject's private credentials. An authentication exchange will be
* attempted with the principal name and the key from the Keytab.
* If successful the TGT will be added to the
* Subject's private credentials set. Otherwise the authentication will
* fail.
*<ul>
* <p><code>useKeyTab</code> = true
* <code>keyTab</code>=< file name > <code>storeKey</code>=true
* <code>principal</code>= < principal name >
* <code>useTicketCache</code>=true
* <code>ticketCache</code>=< file name >;
*</ul>
* <p>The principal's key will be retrieved from the keytab and added
* to the <code>Subject</code>'s private credentials. If the key
* is not available, the
* user will be prompted for the password; the key derived from the password
* will be added to the Subject's private credentials set. The
* client's TGT will be retrieved from the ticket cache and added to the
* <code>Subject</code>'s private credentials. If the TGT is not available
* in the ticket cache, it will be obtained using the authentication
* exchange and added to the Subject's private credentials.
* <ul>
* <p><code>isInitiator</code> = false
*</ul>
* <p>Configured to act as acceptor only, credentials are not acquired
* via AS exchange. For acceptors only, set this value to false.
* For initiators, do not set this value to false.
* <ul>
* <p><code>isInitiator</code> = true
*</ul>
* <p>Configured to act as initiator, credentials are acquired
* via AS exchange. For initiators, set this value to true, or leave this
* option unset, in which case default value (true) will be used.
*
* @version 1.18, 01/11/00
* @author Ram Marti
*/
public class Krb5LoginModule implements LoginModule {
// initial state
private Subject subject;
private CallbackHandler callbackHandler;
private Map sharedState;
private Map options;
// configurable option
private boolean debug = false;
private boolean storeKey = false;
private boolean doNotPrompt = false;
private boolean useTicketCache = false;
private boolean useKeyTab = false;
private String ticketCacheName = null;
private String keyTabName = null;
private String princName = null;
private boolean useFirstPass = false;
private boolean tryFirstPass = false;
private boolean storePass = false;
private boolean clearPass = false;
private boolean refreshKrb5Config = false;
private boolean renewTGT = false;
// specify if initiator.
// perform authentication exchange if initiator
private boolean isInitiator = true;
// the authentication status
private boolean succeeded = false;
private boolean commitSucceeded = false;
private String username;
private EncryptionKey[] encKeys = null;
private Credentials cred = null;
private PrincipalName principal = null;
private KerberosPrincipal kerbClientPrinc = null;
private KerberosTicket kerbTicket = null;
private KerberosKey[] kerbKeys = null;
private StringBuffer krb5PrincName = null;
private char[] password = null;
private static final String NAME = "javax.security.auth.login.name";
private static final String PWD = "javax.security.auth.login.password";
static final java.util.ResourceBundle rb =
java.util.ResourceBundle.getBundle("sun.security.util.AuthResources");
/**
* Initialize this <code>LoginModule</code>.
*
* <p>
* @param subject the <code>Subject</code> to be authenticated. <p>
*
* @param callbackHandler a <code>CallbackHandler</code> for
* communication with the end user (prompting for
* usernames and passwords, for example). <p>
*
* @param sharedState shared <code>LoginModule</code> state. <p>
*
* @param options options specified in the login
* <code>Configuration</code> for this particular
* <code>LoginModule</code>.
*/
public void initialize(Subject subject,
CallbackHandler callbackHandler,
Map<String, ?> sharedState,
Map<String, ?> options) {
this.subject = subject;
this.callbackHandler = callbackHandler;
this.sharedState = sharedState;
this.options = options;
// initialize any configured options
debug = "true".equalsIgnoreCase((String)options.get("debug"));
storeKey = "true".equalsIgnoreCase((String)options.get("storeKey"));
doNotPrompt = "true".equalsIgnoreCase((String)options.get
("doNotPrompt"));
useTicketCache = "true".equalsIgnoreCase((String)options.get
("useTicketCache"));
useKeyTab = "true".equalsIgnoreCase((String)options.get("useKeyTab"));
ticketCacheName = (String)options.get("ticketCache");
keyTabName = (String)options.get("keyTab");
princName = (String)options.get("principal");
refreshKrb5Config =
"true".equalsIgnoreCase((String)options.get("refreshKrb5Config"));
renewTGT =
"true".equalsIgnoreCase((String)options.get("renewTGT"));
// check isInitiator value
String isInitiatorValue = ((String)options.get("isInitiator"));
if (isInitiatorValue == null) {
// use default, if value not set
} else {
isInitiator = "true".equalsIgnoreCase(isInitiatorValue);
}
tryFirstPass =
"true".equalsIgnoreCase
((String)options.get("tryFirstPass"));
useFirstPass =
"true".equalsIgnoreCase
((String)options.get("useFirstPass"));
storePass =
"true".equalsIgnoreCase((String)options.get("storePass"));
clearPass =
"true".equalsIgnoreCase((String)options.get("clearPass"));
if (debug) {
System.out.print("Debug is " + debug
+ " storeKey " + storeKey
+ " useTicketCache " + useTicketCache
+ " useKeyTab " + useKeyTab
+ " doNotPrompt " + doNotPrompt
+ " ticketCache is " + ticketCacheName
+ " isInitiator " + isInitiator
+ " KeyTab is " + keyTabName
+ " refreshKrb5Config is " + refreshKrb5Config
+ " principal is " + princName
+ " tryFirstPass is " + tryFirstPass
+ " useFirstPass is " + useFirstPass
+ " storePass is " + storePass
+ " clearPass is " + clearPass + "\n");
}
}
/**
* Authenticate the user
*
* <p>
*
* @return true in all cases since this <code>LoginModule</code>
* should not be ignored.
*
* @exception FailedLoginException if the authentication fails. <p>
*
* @exception LoginException if this <code>LoginModule</code>
* is unable to perform the authentication.
*/
public boolean login() throws LoginException {
int len;
validateConfiguration();
if (refreshKrb5Config) {
try {
if (debug) {
System.out.println("Refreshing Kerberos configuration");
}
sun.security.krb5.Config.refresh();
} catch (KrbException ke) {
LoginException le = new LoginException(ke.getMessage());
le.initCause(ke);
throw le;
}
}
String principalProperty = System.getProperty
("sun.security.krb5.principal");
if (principalProperty != null) {
krb5PrincName = new StringBuffer(principalProperty);
} else {
if (princName != null) {
krb5PrincName = new StringBuffer(princName);
}
}
if (tryFirstPass) {
try {
attemptAuthentication(true);
if (debug)
System.out.println("\t\t[Krb5LoginModule] " +
"authentication succeeded");
succeeded = true;
cleanState();
return true;
} catch (LoginException le) {
// authentication failed -- try again below by prompting
cleanState();
if (debug) {
System.out.println("\t\t[Krb5LoginModule] " +
"tryFirstPass failed with:" +
le.getMessage());
}
}
} else if (useFirstPass) {
try {
attemptAuthentication(true);
succeeded = true;
cleanState();
return true;
} catch (LoginException e) {
// authentication failed -- clean out state
if (debug) {
System.out.println("\t\t[Krb5LoginModule] " +
"authentication failed \n" +
e.getMessage());
}
succeeded = false;
cleanState();
throw e;
}
}
// attempt the authentication by getting the username and pwd
// by prompting or configuration i.e. not from shared state
try {
attemptAuthentication(false);
succeeded = true;
cleanState();
return true;
} catch (LoginException e) {
// authentication failed -- clean out state
if (debug) {
System.out.println("\t\t[Krb5LoginModule] " +
"authentication failed \n" +
e.getMessage());
}
succeeded = false;
cleanState();
throw e;
}
}
/**
* process the configuration options
* Get the TGT either out of
* cache or from the KDC using the password entered
* Check the permission before getting the TGT
*/
private void attemptAuthentication(boolean getPasswdFromSharedState)
throws LoginException {
/*
* Check the creds cache to see whether
* we have TGT for this client principal
*/
if (krb5PrincName != null) {
try {
principal = new PrincipalName
(krb5PrincName.toString(),
PrincipalName.KRB_NT_PRINCIPAL);
} catch (KrbException e) {
LoginException le = new LoginException(e.getMessage());
le.initCause(e);
throw le;
}
}
try {
if (useTicketCache) {
// ticketCacheName == null implies the default cache
if (debug)
System.out.println("Acquire TGT from Cache");
cred = Credentials.acquireTGTFromCache
(principal, ticketCacheName);
if (cred != null) {
// check to renew credentials
if (!isCurrent(cred)) {
if (renewTGT) {
cred = renewCredentials(cred);
} else {
// credentials have expired
cred = null;
if (debug)
System.out.println("Credentials are" +
" no longer valid");
}
}
}
if (cred != null) {
// get the principal name from the ticket cache
if (principal == null) {
principal = cred.getClient();
}
}
if (debug) {
System.out.println("Principal is " + principal);
if (cred == null) {
System.out.println
("null credentials from Ticket Cache");
}
}
}
// cred = null indicates that we didn't get the creds
// from the cache or useTicketCache was false
if (cred == null) {
// We need the principal name whether we use keytab
// or AS Exchange
if (principal == null) {
promptForName(getPasswdFromSharedState);
principal = new PrincipalName
(krb5PrincName.toString(),
PrincipalName.KRB_NT_PRINCIPAL);
}
if (useKeyTab) {
encKeys =
EncryptionKey.acquireSecretKeys(principal, keyTabName);
if (debug) {
if (encKeys != null)
System.out.println
("principal's key obtained from the keytab");
else
System.out.println
("Key for the principal " +
principal +
" not available in " +
((keyTabName == null) ?
"default key tab" : keyTabName));
}
}
// We can't get the key from the keytab so prompt
if (encKeys == null) {
promptForPass(getPasswdFromSharedState);
encKeys = EncryptionKey.acquireSecretKeys(
password, principal.getSalt());
if (isInitiator) {
if (debug)
System.out.println("Acquire TGT using AS Exchange");
cred = Credentials.acquireTGT(principal,
encKeys, password);
// update keys after pre-auth
encKeys = EncryptionKey.acquireSecretKeys(password,
principal.getSalt());
}
} else {
if (isInitiator) {
if (debug)
System.out.println("Acquire TGT using AS Exchange");
cred = Credentials.acquireTGT(principal,
encKeys, password);
}
}
// Get the TGT using AS Exchange
if (debug) {
System.out.println("principal is " + principal);
HexDumpEncoder hd = new HexDumpEncoder();
for (int i = 0; i < encKeys.length; i++) {
System.out.println("EncryptionKey: keyType=" +
encKeys[i].getEType() + " keyBytes (hex dump)=" +
hd.encode(encKeys[i].getBytes()));
}
}
// we should hava a non-null cred
if (isInitiator && (cred == null)) {
throw new LoginException
("TGT Can not be obtained from the KDC ");
}
}
} catch (KrbException e) {
LoginException le = new LoginException(e.getMessage());
le.initCause(e);
throw le;
} catch (IOException ioe) {
LoginException ie = new LoginException(ioe.getMessage());
ie.initCause(ioe);
throw ie;
}
}
private void promptForName(boolean getPasswdFromSharedState)
throws LoginException {
krb5PrincName = new StringBuffer("");
if (getPasswdFromSharedState) {
// use the name saved by the first module in the stack
username = (String)sharedState.get(NAME);
if (debug) {
System.out.println
("username from shared state is " + username + "\n");
}
if (username == null) {
System.out.println
("username from shared state is null\n");
throw new LoginException
("Username can not be obtained from sharedstate ");
}
if (debug) {
System.out.println
("username from shared state is " + username + "\n");
}
if (username != null && username.length() > 0) {
krb5PrincName.insert(0, username);
return;
}
}
if (doNotPrompt) {
throw new LoginException
("Unable to obtain Princpal Name for authentication ");
} else {
if (callbackHandler == null)
throw new LoginException("No CallbackHandler "
+ "available "
+ "to garner authentication "
+ "information from the user");
try {
String defUsername = System.getProperty("user.name");
Callback[] callbacks = new Callback[1];
MessageFormat form = new MessageFormat(
rb.getString(
"Kerberos username [[defUsername]]: "));
Object[] source = {defUsername};
callbacks[0] = new NameCallback(form.format(source));
callbackHandler.handle(callbacks);
username = ((NameCallback)callbacks[0]).getName();
if (username == null || username.length() == 0)
username = defUsername;
krb5PrincName.insert(0, username);
} catch (java.io.IOException ioe) {
throw new LoginException(ioe.getMessage());
} catch (UnsupportedCallbackException uce) {
throw new LoginException
(uce.getMessage()
+" not available to garner "
+" authentication information "
+" from the user");
}
}
}
private void promptForPass(boolean getPasswdFromSharedState)
throws LoginException {
if (getPasswdFromSharedState) {
// use the password saved by the first module in the stack
password = (char[])sharedState.get(PWD);
if (password == null) {
if (debug) {
System.out.println
("Password from shared state is null");
}
throw new LoginException
("Password can not be obtained from sharedstate ");
}
if (debug) {
System.out.println
("password is " + new String(password));
}
return;
}
if (doNotPrompt) {
throw new LoginException
("Unable to obtain password from user\n");
} else {
if (callbackHandler == null)
throw new LoginException("No CallbackHandler "
+ "available "
+ "to garner authentication "
+ "information from the user");
try {
Callback[] callbacks = new Callback[1];
String userName = krb5PrincName.toString();
MessageFormat form = new MessageFormat(
rb.getString(
"Kerberos password for [username]: "));
Object[] source = {userName};
callbacks[0] = new PasswordCallback(
form.format(source),
false);
callbackHandler.handle(callbacks);
char[] tmpPassword = ((PasswordCallback)
callbacks[0]).getPassword();
if (tmpPassword == null) {
// treat a NULL password as an empty password
tmpPassword = new char[0];
}
password = new char[tmpPassword.length];
System.arraycopy(tmpPassword, 0,
password, 0, tmpPassword.length);
((PasswordCallback)callbacks[0]).clearPassword();
// clear tmpPassword
for (int i = 0; i < tmpPassword.length; i++)
tmpPassword[i] = ' ';
tmpPassword = null;
if (debug) {
System.out.println("\t\t[Krb5LoginModule] " +
"user entered username: " +
krb5PrincName);
System.out.println();
}
} catch (java.io.IOException ioe) {
throw new LoginException(ioe.getMessage());
} catch (UnsupportedCallbackException uce) {
throw new LoginException(uce.getMessage()
+" not available to garner "
+" authentication information "
+ "from the user");
}
}
}
private void validateConfiguration() throws LoginException {
if (doNotPrompt && !useTicketCache && !useKeyTab)
throw new LoginException
("Configuration Error"
+ " - either doNotPrompt should be "
+ " false or useTicketCache/useKeyTab "
+ " should be true");
if (ticketCacheName != null && !useTicketCache)
throw new LoginException
("Configuration Error "
+ " - useTicketCache should be set "
+ "to true to use the ticket cache"
+ ticketCacheName);
if (keyTabName != null & !useKeyTab)
throw new LoginException
("Configuration Error - useKeyTab should be set to true "
+ "to use the keytab" + keyTabName);
if (storeKey && doNotPrompt && !useKeyTab)
throw new LoginException
("Configuration Error - either doNotPrompt "
+ "should be set to false or "
+ "useKeyTab must be set to true for storeKey option");
if (renewTGT && !useTicketCache)
throw new LoginException
("Configuration Error"
+ " - either useTicketCache should be "
+ " true or renewTGT should be false");
}
private boolean isCurrent(Credentials creds)
{
Date endTime = creds.getEndTime();
if (endTime != null) {
return (System.currentTimeMillis() <= endTime.getTime());
}
return true;
}
private Credentials renewCredentials(Credentials creds)
{
Credentials lcreds;
try {
if (!creds.isRenewable())
throw new RefreshFailedException("This ticket" +
" is not renewable");
if (System.currentTimeMillis() > cred.getRenewTill().getTime())
throw new RefreshFailedException("This ticket is past "
+ "its last renewal time.");
lcreds = creds.renew();
if (debug)
System.out.println("Renewed Kerberos Ticket");
} catch (Exception e) {
lcreds = null;
if (debug)
System.out.println("Ticket could not be renewed : "
+ e.getMessage());
}
return lcreds;
}
/**
* <p> This method is called if the LoginContext's
* overall authentication succeeded
* (the relevant REQUIRED, REQUISITE, SUFFICIENT and OPTIONAL
* LoginModules succeeded).
*
* <p> If this LoginModule's own authentication attempt
* succeeded (checked by retrieving the private state saved by the
* <code>login</code> method), then this method associates a
* <code>Krb5Principal</code>
* with the <code>Subject</code> located in the
* <code>LoginModule</code>. It adds Kerberos Credentials to the
* the Subject's private credentials set. If this LoginModule's own
* authentication attempted failed, then this method removes
* any state that was originally saved.
*
* <p>
*
* @exception LoginException if the commit fails.
*
* @return true if this LoginModule's own login and commit
* attempts succeeded, or false otherwise.
*/
public boolean commit() throws LoginException {
/*
* Let us add the Krb5 Creds to the Subject's
* private credentials. The credentials are of type
* KerberosKey or KerberosTicket
*/
if (succeeded == false) {
return false;
} else {
if (isInitiator && (cred == null)) {
succeeded = false;
throw new LoginException("Null Client Credential");
}
if (subject.isReadOnly()) {
cleanKerberosCred();
throw new LoginException("Subject is Readonly");
}
/*
* Add the Principal (authenticated identity)
* to the Subject's principal set and
* add the credentials (TGT or Service key) to the
* Subject's private credentials
*/
Set privCredSet = subject.getPrivateCredentials();
Set princSet = subject.getPrincipals();
kerbClientPrinc = new KerberosPrincipal(principal.getName());
// create Kerberos Ticket
if (isInitiator) {
kerbTicket = Krb5Util.credsToTicket(cred);
}
if (storeKey) {
if (encKeys == null || encKeys.length <= 0) {
succeeded = false;
throw new LoginException("Null Server Key ");
}
kerbKeys = new KerberosKey[encKeys.length];
for (int i = 0; i < encKeys.length; i ++) {
Integer temp = encKeys[i].getKeyVersionNumber();
kerbKeys[i] = new KerberosKey(kerbClientPrinc,
encKeys[i].getBytes(),
encKeys[i].getEType(),
(temp == null?
0: temp.intValue()));
}
}
// Let us add the kerbClientPrinc,kerbTicket and kerbKey (if
// storeKey is true)
if (!princSet.contains(kerbClientPrinc))
princSet.add(kerbClientPrinc);
// add the TGT
if (kerbTicket != null) {
if (!privCredSet.contains(kerbTicket))
privCredSet.add(kerbTicket);
}
if (storeKey) {
for (int i = 0; i < kerbKeys.length; i++) {
if (!privCredSet.contains(kerbKeys[i])) {
privCredSet.add(kerbKeys[i]);
}
encKeys[i].destroy();
encKeys[i] = null;
if (debug) {
System.out.println("Added server's key"
+ kerbKeys[i]);
System.out.println("\t\t[Krb5LoginModule] " +
"added Krb5Principal " +
kerbClientPrinc.toString()
+ " to Subject");
}
}
}
}
commitSucceeded = true;
if (debug)
System.out.println("Commit Succeeded \n");
return true;
}
/**
* <p> This method is called if the LoginContext's
* overall authentication failed.
* (the relevant REQUIRED, REQUISITE, SUFFICIENT and OPTIONAL
* LoginModules did not succeed).
*
* <p> If this LoginModule's own authentication attempt
* succeeded (checked by retrieving the private state saved by the
* <code>login</code> and <code>commit</code> methods),
* then this method cleans up any state that was originally saved.
*
* <p>
*
* @exception LoginException if the abort fails.
*
* @return false if this LoginModule's own login and/or commit attempts
* failed, and true otherwise.
*/
public boolean abort() throws LoginException {
if (succeeded == false) {
return false;
} else if (succeeded == true && commitSucceeded == false) {
// login succeeded but overall authentication failed
succeeded = false;
cleanKerberosCred();
} else {
// overall authentication succeeded and commit succeeded,
// but someone else's commit failed
logout();
}
return true;
}
/**
* Logout the user.
*
* <p> This method removes the <code>Krb5Principal</code>
* that was added by the <code>commit</code> method.
*
* <p>
*
* @exception LoginException if the logout fails.
*
* @return true in all cases since this <code>LoginModule</code>
* should not be ignored.
*/
public boolean logout() throws LoginException {
if (debug) {
System.out.println("\t\t[Krb5LoginModule]: " +
"Entering logout");
}
if (subject.isReadOnly()) {
cleanKerberosCred();
throw new LoginException("Subject is Readonly");
}
subject.getPrincipals().remove(kerbClientPrinc);
// Let us remove all Kerberos credentials stored in the Subject
Iterator it = subject.getPrivateCredentials().iterator();
while (it.hasNext()) {
Object o = it.next();
if (o instanceof KerberosTicket ||
o instanceof KerberosKey) {
it.remove();
}
}
// clean the kerberos ticket and keys
cleanKerberosCred();
succeeded = false;
commitSucceeded = false;
if (debug) {
System.out.println("\t\t[Krb5LoginModule]: " +
"logged out Subject");
}
return true;
}
/**
* Clean Kerberos credentials
*/
private void cleanKerberosCred() throws LoginException {
// Clean the ticket and server key
try {
if (kerbTicket != null)
kerbTicket.destroy();
if (kerbKeys != null) {
for (int i = 0; i < kerbKeys.length; i++) {
kerbKeys[i].destroy();
}
}
} catch (DestroyFailedException e) {
throw new LoginException
("Destroy Failed on Kerberos Private Credentials");
}
kerbTicket = null;
kerbKeys = null;
kerbClientPrinc = null;
}
/**
* Clean out the state
*/
private void cleanState() {
// save input as shared state only if
// authentication succeeded
if (succeeded) {
if (storePass &&
!sharedState.containsKey(NAME) &&
!sharedState.containsKey(PWD)) {
sharedState.put(NAME, username);
sharedState.put(PWD, password);
}
}
username = null;
password = null;
if (krb5PrincName != null && krb5PrincName.length() != 0)
krb5PrincName.delete(0, krb5PrincName.length());
krb5PrincName = null;
if (clearPass) {
sharedState.remove(NAME);
sharedState.remove(PWD);
}
}
}
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